// src/web/opcua_webapi.rs

use crate::interfaces::SemanticConverter;
use crate::services::semantic_conversion::IndustrialSemanticConverter;
use crate::models::{
    ConversionRequest, ConversionResult, OPCUAModel, DataSourceSchema,
    TransformationRules, QualityMetrics
};
use warp::{Filter, Reply};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::sync::Arc;
use tokio::sync::RwLock;
use anyhow::{anyhow, Result as AnyhowResult};
use log::{debug, info, warn, error};
use uuid::Uuid;
use chrono::{DateTime, Utc};
use utoipa::ToSchema;
use super::swagger::build_swagger_routes;

/// OPC UA Web API服务器
/// 提供HTTP接口用于语义转换和OPC UA模型管理
pub struct OPCUAWebApiServer {
    /// 语义转换器
    semantic_converter: Arc<IndustrialSemanticConverter>,
    /// 服务器配置
    config: ServerConfig,
    /// 会话管理
    session_manager: Arc<RwLock<SessionManager>>,
}

/// 服务器配置
#[derive(Debug, Clone, Serialize, Deserialize, utoipa::ToSchema)]
pub struct ServerConfig {
    /// 服务器地址
    pub host: String,
    /// 服务器端口
    pub port: u16,
    /// 工作线程数
    pub workers: usize,
    /// 请求超时时间（秒）
    pub request_timeout_secs: u64,
    /// 最大请求体大小（MB）
    pub max_request_size_mb: usize,
    /// 是否启用CORS
    pub enable_cors: bool,
    /// API版本
    pub api_version: String,
    /// 是否启用认证
    pub enable_auth: bool,
    /// JWT密钥
    pub jwt_secret: Option<String>,
}

/// 会话管理器
pub struct SessionManager {
    /// 活跃会话
    active_sessions: HashMap<String, ConversionSession>,
    /// 会话统计
    session_stats: SessionStatistics,
}

/// 转换会话
#[derive(Debug, Clone, Serialize, Deserialize, utoipa::ToSchema)]
pub struct ConversionSession {
    /// 会话ID
    pub session_id: String,
    /// 用户ID
    pub user_id: String,
    /// 创建时间
    pub created_at: DateTime<Utc>,
    /// 最后活动时间
    pub last_activity: DateTime<Utc>,
    /// 转换历史
    pub conversion_history: Vec<ConversionHistoryItem>,
    /// 会话状态
    pub status: SessionStatus,
}

/// 转换历史项
#[derive(Debug, Clone, Serialize, Deserialize, utoipa::ToSchema)]
pub struct ConversionHistoryItem {
    /// 转换ID
    pub conversion_id: String,
    /// 转换时间
    pub timestamp: DateTime<Utc>,
    /// 数据源类型
    pub data_source_type: String,
    /// 目标OPC UA类型
    pub target_opcua_type: String,
    /// 转换状态
    pub status: ConversionStatus,
    /// 质量评分
    pub quality_score: Option<f64>,
}

/// 会话状态
#[derive(Debug, Clone, Serialize, Deserialize, utoipa::ToSchema)]
pub enum SessionStatus {
    /// 活跃
    Active,
    /// 暂停
    Paused,
    /// 已完成
    Completed,
    /// 已过期
    Expired,
}

/// 转换状态
#[derive(Debug, Clone, Serialize, Deserialize, utoipa::ToSchema)]
pub enum ConversionStatus {
    /// 等待中
    Pending,
    /// 进行中
    InProgress,
    /// 已完成
    Completed,
    /// 失败
    Failed,
    /// 已取消
    Cancelled,
}

/// 会话统计
#[derive(Debug, Default, Serialize, Deserialize, utoipa::ToSchema)]
pub struct SessionStatistics {
    /// 总会话数
    pub total_sessions: u64,
    /// 活跃会话数
    pub active_sessions: u64,
    /// 总转换次数
    pub total_conversions: u64,
    /// 成功转换次数
    pub successful_conversions: u64,
    /// 失败转换次数
    pub failed_conversions: u64,
    /// 平均会话时长（分钟）
    pub avg_session_duration_minutes: f64,
    /// 平均转换时间（毫秒）
    pub avg_conversion_time_ms: f64,
}

/// API请求和响应结构

/// 转换请求
#[derive(Debug, Deserialize, Serialize, utoipa::ToSchema)]
pub struct ConversionApiRequest {
    /// 请求ID（可选，如果不提供将自动生成）
    pub request_id: Option<String>,
    /// 数据源类型
    pub data_source_type: String,
    /// 数据源连接信息
    pub data_source_connection: DataSourceConnectionInfo,
    /// 目标OPC UA类型
    pub target_opcua_type: String,
    /// 转换规则
    pub transformation_rules: Option<TransformationRules>,
    /// 转换选项
    pub options: Option<ConversionOptions>,
    /// 会话ID（可选）
    pub session_id: Option<String>,
}

/// 数据源连接信息
#[derive(Debug, Deserialize, Serialize, utoipa::ToSchema)]
pub struct DataSourceConnectionInfo {
    /// 连接类型
    pub connection_type: String,
    /// 连接字符串
    pub connection_string: String,
    /// 认证信息
    pub authentication: Option<AuthenticationInfo>,
    /// 连接参数
    pub parameters: HashMap<String, serde_json::Value>,
}

/// 认证信息
#[derive(Debug, Deserialize, Serialize, utoipa::ToSchema)]
pub struct AuthenticationInfo {
    /// 认证类型
    pub auth_type: String,
    /// 用户名
    pub username: Option<String>,
    /// 密码
    pub password: Option<String>,
    /// 令牌
    pub token: Option<String>,
    /// API密钥
    pub api_key: Option<String>,
}

/// 转换选项
#[derive(Debug, Deserialize, Serialize, utoipa::ToSchema)]
pub struct ConversionOptions {
    /// 转换模式
    pub conversion_mode: String,
    /// 质量级别
    pub quality_level: String,
    /// 是否启用缓存
    pub enable_cache: bool,
    /// 是否启用验证
    pub enable_validation: bool,
    /// 批处理大小
    pub batch_size: Option<usize>,
    /// 超时时间（秒）
    pub timeout_secs: Option<u64>,
}

/// 转换API响应
#[derive(Debug, Serialize, utoipa::ToSchema)]
pub struct ConversionApiResponse {
    /// 请求ID
    pub request_id: String,
    /// 响应状态
    pub status: ResponseStatus,
    /// 消息
    pub message: String,
    /// 转换结果（如果成功）
    pub result: Option<ConversionResult>,
    /// 错误详情（如果失败）
    pub error_details: Option<ErrorDetails>,
    /// 响应时间（毫秒）
    pub response_time_ms: u64,
    /// 时间戳
    pub timestamp: DateTime<Utc>,
}

/// 响应状态
#[derive(Debug, Serialize, utoipa::ToSchema)]
pub enum ResponseStatus {
    /// 成功
    Success,
    /// 处理中
    Processing,
    /// 失败
    Error,
}

/// 错误详情
#[derive(Debug, Serialize, utoipa::ToSchema)]
pub struct ErrorDetails {
    /// 错误代码
    pub error_code: String,
    /// 错误消息
    pub error_message: String,
    /// 错误类型
    pub error_type: String,
    /// 错误详情
    pub details: Option<HashMap<String, serde_json::Value>>,
    /// 堆栈跟踪
    pub stack_trace: Option<String>,
}

/// 查询转换状态请求
#[derive(Debug, Deserialize, utoipa::ToSchema)]
pub struct QueryConversionRequest {
    /// 转换ID
    pub conversion_id: String,
    /// 包含详细信息
    pub include_details: bool,
}

/// 批量转换请求
#[derive(Debug, Deserialize, utoipa::ToSchema)]
pub struct BatchConversionRequest {
    /// 请求ID
    pub request_id: Option<String>,
    /// 转换请求列表
    pub conversions: Vec<ConversionApiRequest>,
    /// 批处理选项
    pub batch_options: Option<BatchOptions>,
}

/// 批处理选项
#[derive(Debug, Deserialize, utoipa::ToSchema)]
pub struct BatchOptions {
    /// 并行处理数
    pub parallelism: Option<usize>,
    /// 失败时是否继续
    pub continue_on_error: Option<bool>,
    /// 超时时间（秒）
    pub timeout_secs: Option<u64>,
}

/// 获取模型请求
#[derive(Debug, Deserialize, utoipa::ToSchema)]
pub struct GetModelRequest {
    /// 模型ID
    pub model_id: String,
    /// 返回格式
    pub format: Option<String>,
    /// 包含元数据
    pub include_metadata: Option<bool>,
}

/// 验证模型请求
#[derive(Debug, Deserialize, utoipa::ToSchema)]
pub struct ValidateModelRequest {
    /// 模型数据
    pub model_data: OPCUAModel,
    /// 验证规则
    pub validation_rules: Option<Vec<String>>,
}

impl OPCUAWebApiServer {
    /// 创建新的OPC UA Web API服务器
    pub fn new(
        semantic_converter: Arc<IndustrialSemanticConverter>,
        config: ServerConfig,
    ) -> Self {
        Self {
            semantic_converter,
            config,
            session_manager: Arc::new(RwLock::new(SessionManager::new())),
        }
    }

    /// 启动服务器
    pub async fn start(&self) -> AnyhowResult<()> {
        info!("启动OPC UA Web API服务器: {}:{}", self.config.host, self.config.port);

        let semantic_converter = self.semantic_converter.clone();
        let session_manager = self.session_manager.clone();

        // 构建路由
        let routes = self.build_routes(semantic_converter, session_manager);

        // 启动服务器
        let addr = format!("{}:{}", self.config.host, self.config.port);
        warp::serve(routes)
            .run(addr.parse::<std::net::SocketAddr>()?)
            .await;

        Ok(())
    }

    /// 构建API路由
    fn build_routes(
        &self,
        semantic_converter: Arc<IndustrialSemanticConverter>,
        session_manager: Arc<RwLock<SessionManager>>,
    ) -> impl Filter<Extract = impl Reply, Error = warp::Rejection> + Clone {
        let cors = if self.config.enable_cors {
            warp::cors()
                .allow_any_origin()
                .allow_headers(vec!["content-type", "authorization"])
                .allow_methods(vec!["GET", "POST", "PUT", "DELETE", "OPTIONS"])
        } else {
            warp::any().map(|| warp::reply::with::headers([]))
        };

        let semantic_converter_filter = warp::any().map(move || semantic_converter.clone());
        let session_manager_filter = warp::any().map(move || session_manager.clone());

        // 健康检查端点
        let health = warp::path("health")
            .and(warp::get())
            .and_then(Self::handle_health);

        // API版本信息
        let version = warp::path("version")
            .and(warp::get())
            .and_then(Self::handle_version);

        // 语义转换端点
        let convert = warp::path("convert")
            .and(warp::post())
            .and(warp::body::json())
            .and(semantic_converter_filter.clone())
            .and(session_manager_filter.clone())
            .and_then(Self::handle_conversion);

        // 批量转换端点
        let batch_convert = warp::path!("convert" / "batch")
            .and(warp::post())
            .and(warp::body::json())
            .and(semantic_converter_filter.clone())
            .and_then(Self::handle_batch_conversion);

        // 查询转换状态端点
        let query_conversion = warp::path!("convert" / String)
            .and(warp::get())
            .and(warp::query::<QueryConversionRequest>())
            .and_then(Self::handle_query_conversion);

        // 获取模型端点
        let get_model = warp::path!("models" / String)
            .and(warp::get())
            .and(warp::query::<GetModelRequest>())
            .and_then(Self::handle_get_model);

        // 验证模型端点
        let validate_model = warp::path!("models" / "validate")
            .and(warp::post())
            .and(warp::body::json())
            .and_then(Self::handle_validate_model);

        // 会话管理端点
        let create_session = warp::path!("sessions")
            .and(warp::post())
            .and(warp::body::json())
            .and(session_manager_filter.clone())
            .and_then(Self::handle_create_session);

        let get_session = warp::path!("sessions" / String)
            .and(warp::get())
            .and(session_manager_filter.clone())
            .and_then(Self::handle_get_session);

        let delete_session = warp::path!("sessions" / String)
            .and(warp::delete())
            .and(session_manager_filter.clone())
            .and_then(Self::handle_delete_session);

        let get_sessions = warp::path!("sessions")
            .and(warp::get())
            .and(session_manager_filter.clone())
            .and_then(Self::handle_list_sessions);

        // 统计信息端点
        let stats = warp::path!("stats")
            .and(warp::get())
            .and(semantic_converter_filter.clone())
            .and(session_manager_filter.clone())
            .and_then(Self::handle_get_stats);

        // Swagger文档路由
        let swagger_routes = build_swagger_routes();

        // 组合所有路由
        let routes = health
            .or(version)
            .or(convert)
            .or(batch_convert)
            .or(query_conversion)
            .or(get_model)
            .or(validate_model)
            .or(create_session)
            .or(get_session)
            .or(delete_session)
            .or(get_sessions)
            .or(stats)
            .or(swagger_routes)
            .with(cors)
            .with(warp::log("opcua_webapi"));

        routes
    }

    // 处理函数

    /// 健康检查
    async fn handle_health() -> Result<impl Reply, warp::Rejection> {
        let response = serde_json::json!({
            "status": "healthy",
            "timestamp": Utc::now(),
            "service": "OPC UA Web API"
        });

        Ok(warp::reply::json(&response))
    }

    /// API版本信息
    async fn handle_version() -> Result<impl Reply, warp::Rejection> {
        let response = serde_json::json!({
            "api_version": "1.0.0",
            "opcua_version": "1.04",
            "build_time": option_env!("BUILD_TIME").unwrap_or("unknown"),
            "git_commit": option_env!("GIT_COMMIT").unwrap_or("unknown"),
            "rust_version": option_env!("RUST_VERSION").unwrap_or("unknown"),
        });

        Ok(warp::reply::json(&response))
    }

    /// 处理语义转换请求
    async fn handle_conversion(
        request: ConversionApiRequest,
        semantic_converter: Arc<IndustrialSemanticConverter>,
        session_manager: Arc<RwLock<SessionManager>>,
    ) -> Result<impl Reply, warp::Rejection> {
        let start_time = std::time::Instant::now();
        let request_id = request.request_id.unwrap_or_else(|| Uuid::new_v4().to_string());

        info!("收到转换请求: request_id={}", request_id);

        // 创建转换请求
        let conversion_request = match Self::create_conversion_request(&request).await {
            Ok(req) => req,
            Err(e) => {
                let response_time = start_time.elapsed().as_millis() as u64;
                let api_response = ConversionApiResponse {
                    request_id: request_id.clone(),
                    status: ResponseStatus::Error,
                    message: "创建转换请求失败".to_string(),
                    result: None,
                    error_details: Some(ErrorDetails {
                        error_code: "INVALID_REQUEST".to_string(),
                        error_message: e.to_string(),
                        error_type: "ValidationError".to_string(),
                        details: None,
                        stack_trace: None,
                    }),
                    response_time_ms: response_time,
                    timestamp: Utc::now(),
                };
                return Ok(warp::reply::json(&api_response));
            }
        };

        // 执行转换
        match semantic_converter.convert(&conversion_request).await {
            Ok(result) => {
                let response_time = start_time.elapsed().as_millis() as u64;

                // 更新会话（如果提供了会话ID）
                if let Some(session_id) = &request.session_id {
                    if let Err(e) = Self::update_session_with_conversion(
                        &session_manager,
                        session_id,
                        &conversion_request,
                        &result,
                        true,
                    ).await {
                        warn!("更新会话失败: {}", e);
                    }
                }

                let api_response = ConversionApiResponse {
                    request_id: request_id.clone(),
                    status: ResponseStatus::Success,
                    message: "转换完成".to_string(),
                    result: Some(result),
                    error_details: None,
                    response_time_ms: response_time,
                    timestamp: Utc::now(),
                };

                info!("转换成功完成: request_id={}, 耗时={}ms", request_id, response_time);
                Ok(warp::reply::json(&api_response))
            },
            Err(e) => {
                let response_time = start_time.elapsed().as_millis() as u64;

                // 更新会话（如果提供了会话ID）
                if let Some(session_id) = &request.session_id {
                    if let Err(e) = Self::update_session_with_conversion(
                        &session_manager,
                        session_id,
                        &conversion_request,
                        &ConversionResult::default(), // 使用默认结果
                        false,
                    ).await {
                        warn!("更新会话失败: {}", e);
                    }
                }

                let api_response = ConversionApiResponse {
                    request_id: request_id.clone(),
                    status: ResponseStatus::Error,
                    message: "转换失败".to_string(),
                    result: None,
                    error_details: Some(ErrorDetails {
                        error_code: "CONVERSION_ERROR".to_string(),
                        error_message: e.to_string(),
                        error_type: "ConversionError".to_string(),
                        details: None,
                        stack_trace: None,
                    }),
                    response_time_ms: response_time,
                    timestamp: Utc::now(),
                };

                error!("转换失败: request_id={}, error={}", request_id, e);
                Ok(warp::reply::json(&api_response))
            }
        }
    }

    /// 处理批量转换请求
    async fn handle_batch_conversion(
        request: BatchConversionRequest,
        semantic_converter: Arc<IndustrialSemanticConverter>,
    ) -> Result<impl Reply, warp::Rejection> {
        let start_time = std::time::Instant::now();
        let request_id = request.request_id.unwrap_or_else(|| Uuid::new_v4().to_string());

        info!("收到批量转换请求: request_id={}, 转换数量={}",
              request_id, request.conversions.len());

        // 转换为ConversionRequest列表
        let conversion_requests: Result<Vec<_>, _> = request.conversions
            .into_iter()
            .map(|conv_req| Self::create_conversion_request(&conv_req))
            .collect();

        let conversion_requests = match conversion_requests {
            Ok(reqs) => reqs,
            Err(e) => {
                let response = serde_json::json!({
                    "request_id": request_id,
                    "status": "error",
                    "message": "创建批量转换请求失败",
                    "error": e.to_string(),
                    "timestamp": Utc::now()
                });
                return Ok(warp::reply::json(&response));
            }
        };

        // 执行批量转换
        match semantic_converter.batch_convert(&conversion_requests).await {
            Ok(results) => {
                let response_time = start_time.elapsed().as_millis() as u64;
                let success_count = results.len();

                let response = serde_json::json!({
                    "request_id": request_id,
                    "status": "success",
                    "message": "批量转换完成",
                    "results": results,
                    "statistics": {
                        "total_requests": conversion_requests.len(),
                        "successful_conversions": success_count,
                        "response_time_ms": response_time
                    },
                    "timestamp": Utc::now()
                });

                info!("批量转换成功: request_id={}, 成功数量={}, 耗时={}ms",
                      request_id, success_count, response_time);
                Ok(warp::reply::json(&response))
            },
            Err(e) => {
                let response_time = start_time.elapsed().as_millis() as u64;

                let response = serde_json::json!({
                    "request_id": request_id,
                    "status": "error",
                    "message": "批量转换失败",
                    "error": e.to_string(),
                    "response_time_ms": response_time,
                    "timestamp": Utc::now()
                });

                error!("批量转换失败: request_id={}, error={}", request_id, e);
                Ok(warp::reply::json(&response))
            }
        }
    }

    /// 处理查询转换状态
    async fn handle_query_conversion(
        conversion_id: String,
        query: QueryConversionRequest,
    ) -> Result<impl Reply, warp::Rejection> {
        // 这里应该实现查询转换状态的逻辑
        // 暂时返回示例响应
        let response = serde_json::json!({
            "conversion_id": conversion_id,
            "status": "completed",
            "message": "转换查询成功",
            "include_details": query.include_details,
            "timestamp": Utc::now()
        });

        Ok(warp::reply::json(&response))
    }

    /// 处理获取模型
    async fn handle_get_model(
        model_id: String,
        query: GetModelRequest,
    ) -> Result<impl Reply, warp::Rejection> {
        // 这里应该实现获取模型的逻辑
        // 暂时返回示例响应
        let response = serde_json::json!({
            "model_id": model_id,
            "format": query.format.unwrap_or("json".to_string()),
            "include_metadata": query.include_metadata.unwrap_or(false),
            "message": "模型获取成功",
            "timestamp": Utc::now()
        });

        Ok(warp::reply::json(&response))
    }

    /// 处理验证模型
    async fn handle_validate_model(
        request: ValidateModelRequest,
    ) -> Result<impl Reply, warp::Rejection> {
        // 这里应该实现模型验证的逻辑
        // 暂时返回示例响应
        let response = serde_json::json!({
            "validation_result": "valid",
            "message": "模型验证成功",
            "validation_rules": request.validation_rules,
            "timestamp": Utc::now()
        });

        Ok(warp::reply::json(&response))
    }

    /// 处理创建会话
    async fn handle_create_session(
        _session_data: serde_json::Value,
        session_manager: Arc<RwLock<SessionManager>>,
    ) -> Result<impl Reply, warp::Rejection> {
        let session_id = Uuid::new_v4().to_string();
        let user_id = "anonymous".to_string(); // 应该从认证信息中获取

        {
            let mut manager = session_manager.write().await;
            manager.create_session(&session_id, &user_id).await;
        }

        let response = serde_json::json!({
            "session_id": session_id,
            "user_id": user_id,
            "message": "会话创建成功",
            "timestamp": Utc::now()
        });

        Ok(warp::reply::json(&response))
    }

    /// 处理获取会话
    async fn handle_get_session(
        session_id: String,
        session_manager: Arc<RwLock<SessionManager>>,
    ) -> Result<impl Reply, warp::Rejection> {
        let manager = session_manager.read().await;

        if let Some(session) = manager.get_session(&session_id).await {
            let response = serde_json::json!({
                "session": session,
                "message": "会话获取成功",
                "timestamp": Utc::now()
            });
            Ok(warp::reply::json(&response))
        } else {
            let response = serde_json::json!({
                "error": "Session not found",
                "session_id": session_id,
                "timestamp": Utc::now()
            });
            Ok(warp::reply::json(&response))
        }
    }

    /// 处理删除会话
    async fn handle_delete_session(
        session_id: String,
        session_manager: Arc<RwLock<SessionManager>>,
    ) -> Result<impl Reply, warp::Rejection> {
        {
            let mut manager = session_manager.write().await;
            manager.delete_session(&session_id).await;
        }

        let response = serde_json::json!({
            "session_id": session_id,
            "message": "会话删除成功",
            "timestamp": Utc::now()
        });

        Ok(warp::reply::json(&response))
    }

    /// 处理列出会话
    async fn handle_list_sessions(
        session_manager: Arc<RwLock<SessionManager>>,
    ) -> Result<impl Reply, warp::Rejection> {
        let manager = session_manager.read().await;
        let sessions = manager.list_sessions().await;

        let response = serde_json::json!({
            "sessions": sessions,
            "total_count": sessions.len(),
            "message": "会话列表获取成功",
            "timestamp": Utc::now()
        });

        Ok(warp::reply::json(&response))
    }

    /// 处理获取统计信息
    async fn handle_get_stats(
        _semantic_converter: Arc<IndustrialSemanticConverter>,
        session_manager: Arc<RwLock<SessionManager>>,
    ) -> Result<impl Reply, warp::Rejection> {
        let manager = session_manager.read().await;
        let session_stats = manager.get_statistics().await;

        let response = serde_json::json!({
            "session_statistics": session_stats,
            "conversion_statistics": {
                // 这里应该从语义转换器获取统计信息
                "total_conversions": 0,
                "successful_conversions": 0,
                "failed_conversions": 0,
                "avg_conversion_time_ms": 0.0,
                "success_rate": 0.0
            },
            "system_statistics": {
                "uptime_seconds": 0,
                "memory_usage_mb": 0,
                "cpu_usage_percent": 0.0,
                "active_connections": 0
            },
            "timestamp": Utc::now()
        });

        Ok(warp::reply::json(&response))
    }

    // 辅助方法

    /// 创建转换请求
    async fn create_conversion_request(
        api_request: &ConversionApiRequest,
    ) -> AnyhowResult<ConversionRequest> {
        let request_id = api_request.request_id.clone()
            .unwrap_or_else(|| Uuid::new_v4().to_string());

        // 这里应该根据API请求构建ConversionRequest
        // 暂时返回基本结构
        Ok(ConversionRequest {
            id: request_id,
            source_data_type: api_request.data_source_type.clone(),
            target_opcua_type: api_request.target_opcua_type.clone(),
            source_schema: DataSourceSchema::default(), // 需要从连接信息提取
            transformation_rules: api_request.transformation_rules.clone()
                .unwrap_or_else(|| TransformationRules::default()),
            timestamp: Utc::now(),
        })
    }

    /// 更新会话信息
    async fn update_session_with_conversion(
        session_manager: &Arc<RwLock<SessionManager>>,
        session_id: &str,
        conversion_request: &ConversionRequest,
        conversion_result: &ConversionResult,
        success: bool,
    ) -> AnyhowResult<()> {
        let mut manager = session_manager.write().await;

        if let Some(session) = manager.active_sessions.get_mut(session_id) {
            session.last_activity = Utc::now();

            let history_item = ConversionHistoryItem {
                conversion_id: conversion_request.id.clone(),
                timestamp: conversion_request.timestamp,
                data_source_type: conversion_request.source_data_type.clone(),
                target_opcua_type: conversion_request.target_opcua_type.clone(),
                status: if success { ConversionStatus::Completed } else { ConversionStatus::Failed },
                quality_score: Some(conversion_result.statistics.quality_score),
            };

            session.conversion_history.push(history_item);

            // 更新统计信息
            manager.session_stats.total_conversions += 1;
            if success {
                manager.session_stats.successful_conversions += 1;
            } else {
                manager.session_stats.failed_conversions += 1;
            }
        }

        Ok(())
    }
}

impl SessionManager {
    pub fn new() -> Self {
        Self {
            active_sessions: HashMap::new(),
            session_stats: SessionStatistics::default(),
        }
    }

    pub async fn create_session(&mut self, session_id: &str, user_id: &str) {
        let session = ConversionSession {
            session_id: session_id.to_string(),
            user_id: user_id.to_string(),
            created_at: Utc::now(),
            last_activity: Utc::now(),
            conversion_history: Vec::new(),
            status: SessionStatus::Active,
        };

        self.active_sessions.insert(session_id.to_string(), session);
        self.session_stats.total_sessions += 1;
        self.session_stats.active_sessions += 1;
    }

    pub async fn get_session(&self, session_id: &str) -> Option<&ConversionSession> {
        self.active_sessions.get(session_id)
    }

    pub async fn delete_session(&mut self, session_id: &str) {
        if self.active_sessions.remove(session_id).is_some() {
            self.session_stats.active_sessions -= 1;
        }
    }

    pub async fn list_sessions(&self) -> Vec<&ConversionSession> {
        self.active_sessions.values().collect()
    }

    pub async fn get_statistics(&self) -> &SessionStatistics {
        &self.session_stats
    }
}

impl Default for ConversionResult {
    fn default() -> Self {
        Self {
            id: "default".to_string(),
            source_schema: DataSourceSchema::default(),
            opcua_model: OPCUAModel::default(),
            conversion_rules: TransformationRules::default(),
            quality_metrics: QualityMetrics::default(),
            statistics: crate::services::semantic_conversion::ConversionStatistics::default(),
            conversion_time: std::time::Duration::from_secs(0),
            timestamp: Utc::now(),
        }
    }
}

impl Default for OPCUAModel {
    fn default() -> Self {
        Self {
            model_id: "default".to_string(),
            model_name: "Default Model".to_string(),
            model_version: "1.0".to_string(),
            description: Some("Default OPC UA model".to_string()),
            namespace_array: Default::default(),
            nodes: Vec::new(),
            references: Vec::new(),
            created_at: Utc::now(),
            updated_at: Utc::now(),
        }
    }
}

impl Default for QualityMetrics {
    fn default() -> Self {
        Self {
            semantic_completeness: 0.0,
            type_consistency: 0.0,
            performance_efficiency: 0.0,
            scalability: 0.0,
            interoperability: 0.0,
        }
    }
}

// 编译时环境变量（需要在构建时设置）
pub const BUILD_TIME: &str = option_env!("BUILD_TIME").unwrap_or("unknown");
pub const GIT_COMMIT: &str = option_env!("GIT_COMMIT").unwrap_or("unknown");
pub const RUST_VERSION: &str = option_env!("RUST_VERSION").unwrap_or("unknown");